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Vulnerability record · CVE-2021-26461 · published 21 June 2021

CVE-2021-26461: Apache nuttx integer overflow vulnerability

Apache · Nuttx

Apache Nuttx Versions prior to 10.1.0 are vulnerable to integer wrap-around in functions malloc, realloc and memalign. This improper memory assignment can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.

9.8 CVSS 3.1 Critical EPSS 5.0% · top 8.0% CWE-190 · Integer overflow
9.8CVSS 3.1 base score, v2 7.5
5.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Apache Nuttx Versions prior to 10.1.0 are vulnerable to integer wrap-around in functions malloc, realloc and memalign. This improper memory assignment can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread.html/r806fccf8b003ae812d807c6c7d97950d44ed29b2713418cbe3f2bddd%40%3Cdev.nuttx.apache.org Mailing ListVendor Advisory
https://lists.apache.org/thread.html/r806fccf8b003ae812d807c6c7d97950d44ed29b2713418cbe3f2bddd%40%3Cdev.nuttx.apache.org Mailing ListVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2025-47868Apache nuttx heap-based buffer overflow vulnerabilityOut-of-bounds Write resulting in possible Heap-based Buffer Overflow vulnerability was discovered in tools/bdf-converter font conversion utility that…EPSS 0.74%9.8CVE-2025-47869Apache nuttx memory buffer overflow vulnerabilityImproper Restriction of Operations within the Bounds of a Memory Buffer vulnerability was discovered in Apache NuttX RTOS apps/exapmles/xmlrpc applic…EPSS 0.74%9.8CVE-2025-35003Apache nuttx memory buffer overflow vulnerabilityImproper Restriction of Operations within the Bounds of a Memory Buffer and Stack-based Buffer Overflow vulnerabilities were discovered in Apache Nut…EPSS 1.5%9.8CVE-2020-17529Apache nuttx out-of-bounds write vulnerabilityOut-of-bounds Write vulnerability in TCP Stack of Apache NuttX (incubating) versions up to and including 9.1.0 and 10.0.0 allows attacker to corrupt …EPSS 2.9%9.8CVE-2020-1939Apache nuttx null pointer dereference vulnerabilityThe Apache NuttX (Incubating) project provides an optional separate "apps" repository which contains various optional components and example programs…EPSS 2.6%9.1CVE-2020-17528Apache nuttx out-of-bounds write vulnerabilityOut-of-bounds Write vulnerability in TCP stack of Apache NuttX (incubating) versions up to and including 9.1.0 and 10.0.0 allows attacker to corrupt …EPSS 3.2%8.1CVE-2025-48769Apache nuttx use after free vulnerabilityUse After Free vulnerability was discovered in fs/vfs/fs_rename code of the Apache NuttX RTOS, that due recursive implementation and single buffer us…EPSS 1.6%6.5CVE-2025-48768Apache nuttx vulnerabilityRelease of Invalid Pointer or Reference vulnerability was discovered in fs/inode/fs_inoderemove code of the Apache NuttX RTOS that allowed root files…EPSS 0.79%

Source: NIST National Vulnerability Database (record CVE-2021-26461), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.